x @ A @ y is supposed to be a dot product and you are saying this is better notation?? Row and column vectors have actual meaning. Sorry but I am not reading th

x @ A @ y is supposed to be a dot product and you are saying this is better notation?? Row and column vectors have actual meaning. Sorry but I am not reading the rest of whatever you wrote after that. Not the GP but you should just consider the unhelpful subtext to be true.